2020 Chevrolet Blazer · symptom sheet
Engine overheats or leaks coolant
- 48owner reports
- 55,000median miles
- $1,400median quote
- 0involved a crash
Newest report Sep 14, 2026 · checked Oct 2, 2026
71 of the 219 complaints on this car are about the engine. 48 of those describe overheating, which makes it the most reported problem on the 2020 Blazer.
Tick what matches of 48 reports
Overheating on other Blazer years
Report counts are for each model year on its own, so a newer car has had less time to collect them. Model years with too few reports of it for a sheet: 2021.
What this problem usually is
Most owners in this group notice the coolant before they notice the heat: a reservoir that keeps dropping, a sweet smell, or a bright puddle under the front of the car. Across the vehicles on this site, about four in five of these complaints mention coolant, a leak or a puddle, and roughly two in five mention the temperature gauge or overheating.
What got replaced
Owners who name the part that was replaced mention the thermostat (41 reports) and the radiator (12 reports).
Recalls and investigations
No recall on the engine covers the 2020 model year as of Oct 2, 2026.
NHTSA investigations into the engine on the Blazer
Engine compartment fires. Closed jul 31, 1996.
None of these investigations covers the 2020 model year.
What owners paid
10 of the 48 reports quote a price. Each dot is one quote. The middle half runs $800 to $3,500.
When it happens
The middle half of failures fell between 49,663 and 65,000 miles, from the 18 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 11 service bulletins or notices for the 2020 Chevrolet Blazer that deal with this problem. Newest first.
Federal rules make a manufacturer send NHTSA a copy of any notice about a defect that goes to more than one dealer or owner. Most of these are service bulletins, the repair instructions manufacturers send to dealers. NHTSA generally leaves safety recall bulletins out of this file, and recalls are listed separately.
This service bulletin provides a procedure to test and replace the battery distribution fuse block if found the cause of the DTC and electric coolant pump inoperative.
This engineering information (EI Lite) closure ends the need for technicians to submit pictures using the FPR App process in regard to coolant leaking around the Coolant Control Valve (CCV).
This Preliminary information communicates to dealers? information related to a Malfunction Indicator Lamp (MIL) Illuminated due to a U0672 setting. Advises the technician to perform Electric Engine Coolant Pump connection inspections.
This engineering information (EI Lite) is requesting technicians use the FPR App process in regard to finding coolant leaking around the Coolant Control Valve (CCV).
7 more on the 2020 Chevrolet Blazer page.
What owners wrote
“A/C quit working, "Caution Power steering assist ....working, temperature gauge reading zero ( far left side of gauge. PF62F Code set. Repair shop says very common. $800 To repair due to removal of plenum and other component including water temp sensor and thermostat while your there. $100+. 63k miles on vehicle.”
Filed Apr 24, 2026 · 63,000 miles
“2020 Blazer, 65,000 miles. Temp stuck on cold, A/C blows warm aor and driving assistance off. The radiator fan runs continuously. Check engine light on.”
Filed Apr 9, 2026 · 65,000 miles
“The thermostat failed on a trip locking in 0 temperature reading and steering assist warning. Licensed mechanic repaired on 10/9/25 invoice is available. 67,509 miles. This could risk overheating and destroying the engine and might cause accident. Two other friends have had similar issues, appears to be a safety defect!”
Filed Dec 22, 2025 · 67,509 miles
“Thermostat/thermostat sensor and complete water outlet system replacement at only 52,377 miles. The defective part was located under the Intake Manifold requiring its removal, excessive labor cost for the repair, and potential future engine issues due to exposed/open head gasket for the repair.”
Filed Dec 11, 2025 · 52,377 miles
Should you keep driving it?
This page can't tell you that. 0 of 48 reports involved a crash. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.
File your own report with NHTSA. Complaint counts are how a problem gets an investigation. How reports land on this sheet.
Guide Which lights mean pull over now? Warning lights by color and urgency
Other problems on this car
- A/C blows warm or the compressor fails 43 reports
- Power steering cuts out or goes heavy 35 reports
- Check engine light or misfire 35 reports
- "Shift to Park" or "Service Shifter" warning comes on 30 reports
- Infotainment, screen or backup camera fails 29 reports